package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    private static List<LocalDate> getLocalDateList(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        return dateList;
    }

    /**
     * 营业额统计
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getLocalDateList(begin, end);
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.sumByMap(map);
            //处理营业额为空的情况
            turnoverList.add(turnover == null ? 0.0 : turnover);
        }
        String date = StringUtils.join(dateList, ",");
        return TurnoverReportVO
                .builder()
                .dateList(date)
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * 用户统计
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getLocalDateList(begin, end);
        List<Integer> newUserList = new ArrayList<>();
        List<Integer> totalUserList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            Integer countAll = userMapper.countTotalByMap(map);
            Integer countNew = userMapper.countNewByMap(map);
            totalUserList.add(countAll);
            newUserList.add(countNew);
        }
        return UserReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 订单统计
     */
    @Override
    public OrderReportVO getOrdersStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = getLocalDateList(begin, end);
        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        Integer sum = 0;
        Integer validSum = 0;
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
            map.put("begin", beginTime);
            map.put("end", endTime);
            Integer orderNum = orderMapper.countTotalByMap(map);
            orderCountList.add(orderNum);
            sum += orderNum;
            Integer validOrderNum = orderMapper.countValidByMap(map);
            validOrderCountList.add(validOrderNum);
            validSum += validOrderNum;
        }
        Double orderCompletionRate = 0.0;
        if (sum != 0) {
            orderCompletionRate = validSum.doubleValue() / sum;
        }
        return OrderReportVO
                .builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(sum)
                .validOrderCount(validSum)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 销量排名top10
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(map);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ",");
        List<Integer> numberList = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberListString = StringUtils.join(numberList, ",");
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberListString)
                .build();
    }

    /**
     * 导出运营数据Excel表
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        LocalDateTime begin = LocalDateTime.of(dateBegin, LocalTime.MIN);
        LocalDateTime end = LocalDateTime.of(dateEnd, LocalTime.MAX);
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(begin, end);
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            XSSFSheet sheet1 = excel.getSheet("Sheet1");
            //设置日期区间
            sheet1.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);
            //得到第四行
            XSSFRow row3 = sheet1.getRow(3);
            //写入营业额
            row3.getCell(2).setCellValue(businessDataVO.getTurnover());
            //写入订单完成率
            row3.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            //写入新增用户数
            row3.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //得到第五行
            XSSFRow row4 = sheet1.getRow(4);
            //写入有效订单数
            row4.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            //写入单品平均客单价
            row4.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //循环获取近30天的运营数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
                XSSFRow row = sheet1.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }


            //通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream outputStream = response.getOutputStream();
            excel.write(outputStream);
            outputStream.close();
            excel.close();
            in.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}
